. >> nasa says an asteroid half the size of a football field will whiz by, close to the earth today. >> inside to say, while there is no cause for concern, it will pass by a remarkably close the distance. around 17,000 mi. or 27,000 kiloliters. tom foreman explains a close call. >> where is this asteroid going to be. it is going to shoot out of the sky and cut right through the top of the satellite built at about 17,000 mi.. is that dangerous? not really. in part because the size of this. the official name is 2012 the a 14. it can travel 18,000 mi. an hour. if it were to hit earth it would have a huge explosion. that would not be enough to harm the turf unless it hit a populated place. it will knock down trees and destroyed areas and several hundred miles. scientists have been tracking it for more than 2 million mi.. they say it will not hit the earth and ms. even though it is a close call. >> tonight at 7 the juchab ot space and science center will hold an asteroid during party for the 2012 da -14 asteroid. >> sizes and astronomers will be on deck to enter any questions. >> we're ge